package com.lrm.service;

import com.lrm.NotFoundException;
import com.lrm.dao.BlogRepository;
import com.lrm.po.Blog;
import com.lrm.po.Type;
import com.lrm.util.MarkdownUtils;
import com.lrm.util.MyBeanUtils;
import com.lrm.vo.BlogQuery;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.util.*;

@Service
public class BlogServiceImpl implements BlogService
{
    @Autowired
    private BlogRepository blogRepository;


    @Override
    public Blog getBlog(Long id) {
        return blogRepository.findOne(id);
    }

    @Override
    public Blog getAndConvert(Long id) {
        Blog blog =blogRepository.findOne(id);
        if(blog==null){
            throw  new   NotFoundException("资源不存在");
        }
        Blog b =new Blog();
        BeanUtils.copyProperties(blog,b);
        String content =b.getContent();

        b.setContent(MarkdownUtils.markdownToHtmlExtensions(content));
        blogRepository.updateViews(id);
        return  b;
    }

    public Page<Blog> listBlog(Pageable pageable, BlogQuery blog) {
        return blogRepository.findAll(new Specification<Blog>() {
            @Override
            public Predicate toPredicate(Root<Blog> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
                List<Predicate> predicates = new ArrayList<>();
                if (!"".equals(blog.getTitle()) && blog.getTitle() != null) {
                    predicates.add(cb.like(root.<String>get("title"), "%"+blog.getTitle()+"%"));
                }
                if (blog.getTypeId() != null) {
                    predicates.add(cb.equal(root.<Type>get("type").get("id"), blog.getTypeId()));
                }
                if (blog.isRecommend()) {
                    predicates.add(cb.equal(root.<Boolean>get("recommend"), blog.isRecommend()));
                }
                cq.where(predicates.toArray(new Predicate[predicates.size()]));
                return null;
            }
        },pageable);
    }

    @Override
    public Page<Blog> listBlog(Pageable pageable) {
        return blogRepository.findAll(pageable);
    }

    @Override
    public Page<Blog> listBlog(String query, Pageable pageable) {
        return blogRepository.findByQuery(query,pageable);
    }

    @Override
    public List<Blog> listRecommendBlogTop(Integer size) {

        Sort sort=new Sort(Sort.Direction.DESC,"updateTime");
        Pageable pageable =new PageRequest(0,size,sort);
        return blogRepository.findTop(pageable);
    }

    @Override
    public Long countBlog() {
        return blogRepository.count();
    }

    @Override
    public Map<String, List<Blog>> archiveBlog() {

        List<String> years=blogRepository.findGroupYear();
        Map<String,List<Blog>> map=new HashMap<>();
        for(String year:years){
            map.put(year,blogRepository.findByYear(year));
        }
        return map;
    }

    @Override
    public Blog saveBlog(Blog blog) {

        return blogRepository.save(blog);
    }

    @Transactional
    @Override
    public Blog updateBlog(Long id, Blog blog) {
        Blog b = blogRepository.findOne(id);
        if (b == null) {
            throw new NotFoundException("该博客不存在");
        }
        BeanUtils.copyProperties(blog,b, MyBeanUtils.getNullPropertyNames(blog));
        b.setUpdateTime(new Date());
        return blogRepository.save(b);
    }
    @Override
    public void deleteBlog(Long id) {
        blogRepository.delete(id);
    }
}
